Note 9 - Retirement Plans - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 29, 2024	Jul. 01, 2023
Service cost including administrative expenses	$ 1,591	$ 1,736
Interest cost	2,942	2,818
Expected return on plan assets	(4,423)	(4,174)
Amortization of net loss	76	0
Amortization of prior service cost	2	19
Net periodic benefit cost	$ 188	$ 399